<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form method="post" action="t6">
    <input type="text" name="username"> <br><br>
    <input type="password" name="password"> <br><br>
    运动：
    <input type="checkbox" name="exercise" value="1"> 跑步
    <input type="checkbox" name="exercise" value="2"> 打球
    <input type="checkbox" name="exercise" value="3"> 游泳 <br><br>

    <input type="submit" value="提交">
</form>
</body>
</html>